Remove unmaintained commands

[eigan]

• Config convert did not work anymore because all related migrators was removed years ago
• Mapping import was dropped in doctrine back in 2019 https://symfony.com/doc/current/doctrine/reverse_engineering.html it also used deprecated classes.

[codecov-commenter]

Codecov Report

Base: 57.97% // Head: 61.68% // Increases project coverage by +3.71% :tada:

Coverage data is based on head (809ab72) compared to base (c586aea). Patch has no changes to coverable lines.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2.0 #546 +/- ## ============================================ + Coverage 57.97% 61.68% +3.71% + Complexity 664 641 -23 ============================================ Files 92 90 -2 Lines 2208 2075 -133 ============================================ Hits 1280 1280 + Misses 928 795 -133 ``` | [Impacted Files](https://codecov.io/gh/laravel-doctrine/orm/pull/546?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/DoctrineServiceProvider.php](https://codecov.io/gh/laravel-doctrine/orm/pull/546?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL0RvY3RyaW5lU2VydmljZVByb3ZpZGVyLnBocA==) | `0.00% <ø> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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